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Semaphorin iOS Downgrade Tool

Promotion image of Semaphorin article.

Semaphorin originated from johndoe123's iOS 7 Tethered Downgrade guide and has evolved into a solution for downgrading A7, A8, A8X, and A9 devices, including iPhone 5s, iPhone 6, iPhone 6s, and iPhone SE (2016) to versions ranging from iOS 7.0.1 to iOS 9.2.1. Please be aware that this script deletes everything on your phone, including the main iOS. Backup all your data before using this script, as it will be unrecoverable after.

Summary

  • macOS Sonoma 14.4.1 is too new for Semaphorin script to run. It's recommended to install macOS High Sierra, Mojave, or Catalina to continue.
  • Semaphorin script was specifically tailored for Mac users, with no current plans for a dedicated version to accommodate Windows or Linux users.
  • If you like to downgrade your checkm8 devices to iOS 7.0.6 – iOS 9.2.1 you can use the semaphorin script for macOS based on seprmvr64 by mineek.
  • Semaphorin also offers support for downgrading to iOS 10.3.3 – iOS 11.1, but this capability is exclusively accessible through the dualboot feature.
  • This script enables the execution of a tethered downgrade without the need for the SHSH blob. A tethered downgrade necessitates a computer to boot up the device when the battery is completely drained.

Download

Semaphorin was released as a command line tool where you can execute the semaphorin.sh script, or as an application based on the checkra1n interface. Download the most recent version of Semaphorin GUI 1.0, the tether downgrade utility for A7, A8, A8X, A9, A9X, and A10 iDevices. The next release will increase support for A10X and A11.

Last updated: May 22, 2024
Developer: y08wilm
Version: 1.0
Size: 202 MB


Overview

Semaphorin is a downgrade tool designed to execute on A7 - A9 iDevice running iOS 12.5.7, iOS 11, or iOS 10, downgrade to earlier versions such as iOS 9, iOS 8, or iOS 7. For optimal compatibility with App Store, jailbreaks, system hardware, and other functionalities, it is recommended to downgrade to iOS 7.1. On iOS 7.0.6 volume and home buttons will not work. Semaphorin was released for macOS, Windows, and Linux PCs are not supported.

This tethered downgrade utility currently caters to all A7 devices, with future releases set to include support for A8 and A8X devices as well. Semaphori simplifies the process by also jailbreaking iOS during the downgrade, eliminating the need for manual intervention. Additionally, it ensures that sideloading the app store remains functional on iOS 7.

Semaphorin currently supports downgrades to different iOS versions based on the device type. For iPhone 5s, it supports iOS 7.0.6 to 10.2.1. For iPad Mini 2, it supports iOS 7.0.3 to 10.2.1. For iPad Air 1, it supports iOS iOS 7.0.1 – 10.2.1. For iPad Mini 2 (China) and iPad Air 1 (China), it supports iOS 7.1 to 10.2.1. This release also supports A8 and A8X; iPhone 6 and iPhone 6s.

Screenshot of Semaphorin App on macOS.

In forthcoming updates, Semaphorin will extend its support to include iPhone 6/6+, iPhone 6s/6s+, and iPhone 7/7+, along with a broad range of iPad models. This is already a work in progress. At its initial release, the program also provides compatibility with iOS 8 beta 4 on A7 devices. This development is significant for the jailbreaking community as it not only facilitates jailbreaking through sep-less downgrade but also enables sideloading.

The script is tailored for macOS High Sierra, Mojave, and Catalina. While it might work with newer macOS versions, compatibility with such versions hasn't been thoroughly tested. Semaphorin is a seprmvr64, downgrade, and jailbreak utility packed into one software.

What's new

  • Overall improvement and bug fixes.
  • Added iOS 11.0 beta 1 and iOS 12 support.
  • Fixed kernel panic during boot on some devices on iOS 11.
  • Fixed activation_records not copying over on some devices.
  • Fixed first boot taking 10 years on iOS 11 and iOS 12.
  • Fixed iOS 8.0 beta 4 downgrades.
  • Fixed cell service on iOS 7.
  • Added support for iOS 9.3.x downgrades.
  • Added support for iOS 10.0 – iOS 10.2.1 downgrades.
  • Serial debugging feature included.
  • iDevice activation improvements.
  • Update FirmwareKeys.
  • Improved downgrade script behavior.
  • Updated Kernel64Patcher.
  • Overall improvements and bug fixes.

The script currently has the capability to technically boot iOS 9.0 to iOS 9.2.1 on A7, A8, and A8X devices. However, a significant issue arises as all containerized apps are absent from the home screen and fail to function due to the inability of keybags to unlock on these versions when the Secure Enclave Processor (SEP) is patched out. Keybags are essential for the operation of containerized apps, encompassing the majority of system apps on iOS 9 as well as user apps.

Screenshot of running semaphorin script inside terminal app on macOS.

Nevertheless, there is a glimmer of hope. In iOS 9.3 and beyond, keybags do unlock, presenting an opportunity. If we can successfully boot iOS 9.3 to iOS 10.2, it would ensure the proper functioning of all containerized system apps and user apps as intended. This advancement would signify comprehensive support for A8 and A8X devices within the script.

However, the challenge with iOS 9.3 to iOS 10.2 lies in the numerous sandbox errors encountered upon downgrading to these versions. These errors stem from seprmvr64 and are not attributable to any fault within the script itself. To overcome this hurdle, a sandbox patch is required. Presently, the script employs the Taig sandbox patch, which unfortunately remains ineffective on iOS 9.3 to iOS 10.2.

Avatar
y08wilm
Semaphorin Developer
Preliminary Linux support has been merged to main for testing purposes. iOS 9 downgrades are supported on Linux for both A8 and A9 devices.

The Semaphorin downgrade tool offers a range of main operation modes, each serving distinct purposes. It allows users to "Download & enter ramdisk," a self-explanatory step, facilitating seamless transitions into ramdisk mode. Another essential function is the option to "Enable serial debugging," which endeavors to establish a connection to SSH over the USB interface of the connected device, enabling streamlined debugging processes.

It provides also the capability to "Don't enter ramdisk or wipe the device, just boot". Moreover, it offers functionalities to safeguard data integrity, such as "Adds the 'protect' flag to /dev/disk0s1s2" and "Removes the 'protect' flag from /dev/disk0s1s2," ensuring data protection.

Screenshot of downloading openlogic for Semaphorin downgrade tool.

Additionally, the tool supports comprehensive backup procedures, exemplified by "Backs up the entire contents of your iOS device to disk0.gz," ensuring data security throughout the downgrade process. Furthermore, it addresses specific compatibility issues, such as "Fixes activation on iOS 10.3.3-11.1," ensuring smooth navigation through Setup.app post-downgrade.

Finally, for A11 devices like the iPhone X, the tool offers crucial support by "Fixing booting into the main OS," ensuring seamless functionality and performance post-downgrade.


How to downgrade iOS using Semaphorin

Semaphorin initially debuted as an application featuring a graphical interface. However, it's also possible to execute this tethered downgrade script directly from a terminal. Follow these steps to download Semaphorin and initiate the downgrade process seamlessly.

Step 1. Connect your iDevice to macOS via a USB cable.

Step 2. Enter DFU mode on your iPhone or iPad.

Step 3. Open the Terminal app.

Step 4. Clone Semaphorin repository to local disk.

git clone --recursive https://github.com/y08wilm/Semaphorin

Step 5. Navigate into the 'Semaphorin' folder.

cd Semaphorin

Step 6. Allow the script to be executed on your Mac.

chmod +x ./semaphorin.sh

Step 7. Install Xcode Command Line Tools on your macOS.

xcode-select install

Step 8. Run the semaphorin.sh script and follow the instructions.

sudo ./semaphorin.sh --restore <the version you are trying to downgrade to>

Available Commands

Usage: $0 [VERSION...] [OPTION...]

Examples:
    $0 7.1.2 --restore
    $0 7.1.2 --boot

Main operation mode:
    --help                     Print this help
    --ramdisk                  Download & enter ramdisk
    --dump-blobs               Self explanatory
    --serial                   Enable serial debugging
    --ssh                      Tries to connect to ssh over usb interface to the connected device
    --restore                  Wipe device and downgrade ios
    --dump-nand                Backs up the entire contents of your iOS device to disk0.gz
    --NoMoreSIGABRT            Adds the "protect" flag to /dev/disk0s1s2
    --disable-NoMoreSIGABRT    Removes the "protect" flag from /dev/disk0s1s2
    --restore-nand             Copies the contents of disk0.gz to /dev/disk0 of the iOS device
    --restore-mnt1             Copies the contents of disk0s1s1.gz to /dev/disk0s1s1 of the iOS device
    --restore-mnt2             Copies the contents of disk0s1s2.gz to /dev/disk0s1s2 of the iOS device
    --boot                     Don't enter ramdisk or wipe device, just boot
    --clean                    Delete all the created boot files for your device
    --fix-activation           Fixes activation on iOS 10.3.3-11.1 so you can navigate through Setup.app
    --fix-auto-boot            Fixes booting into the main OS on A11 devices such as the iPhone X
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Written by

Kuba has over 20 years of experience in journalism, focusing on jailbreak since 2012. He has interviewed professionals from various companies. Besides journalism, Kuba specializes in video editing and drone flying. He studied IT at university before his writing career.

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